One-Stage Femoral Osteotomy and Computer-Assisted Navigation Total Knee Arthroplasty for Osteoarthritis in a Patient with Femoral Subtrochanteric Fracture Malunion
(a) Standing scanogram of the right lower limb. Mechanical axis deviation (MAD) is 5 cm from knee center. Medial proximal tibial angle (MTPA) is 84°. (b) Anteroposterior X-ray of right femur. Medial proximal femoral angle (MPFA) is 89°. Anatomical lateral distal femoral angle (aLDFA) is 89°. Lateral angulation at the center of rotation of angulation (CORA) is 20°. (c) Lateral X-ray of right femur. Anterior angulation at CORA is 40°. (d) Computer tomography of right hip, right femoral shaft at apex of deformity, and right femoral condyle. The femoral neck anteversion is 15°. The medullary canal is obliterated at the apex of deformity.